Why is no number used in the names ethene and propene
{"Image DocumentName": "Why is no number used in the names ethene and propene ?", "Image ImageDescription": "There is only one place you can put the double bond for both molecules.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}